Faking the number of CPUs for dom0 with dom0_max_vcpus

[Jimmy Lee <jimmylee4930@xxxxxxxxx>]

Hello Xen experts, I am trying to set dom0_max_vcpus to a number that is larger than the number of pcpus. For example, I have a 4-CPU machine but I want applications in dom0 to have an illusion that they are running on a 64-cpu machine. However, it seems that dom0 will always recognize the number of pcpus. I can see the vcpus in the output of "xl vcpu-list" but most of them are not online. How can I achieve my goal? Thanks!

Jimmy

[root@ip-10-0-131-61 cpu3]# xl vcpu-list
Name                                ID  VCPU   CPU State   Time(s) Affinity (Hard / Soft)
Domain-0                             0     0    0   r--      15.9  all / all
Domain-0                             0     1    3   -b-      11.9  all / all
Domain-0                             0     2    1   -b-      11.2  all / all
Domain-0                             0     3    2   -b-      12.4  all / all
Domain-0                             0     4    -   --p       0.0  all / all
Domain-0                             0     5    -   --p       0.0  all / all
Domain-0                             0     6    -   --p       0.0  all / all
Domain-0                             0     7    -   --p       0.0  all / all
Domain-0                             0     8    -   --p       0.0  all / all
....

[root@ip-10-0-131-61 cpu3]# lscpu

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    4
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1

...

[root@ip-10-0-131-61 cpu3]# xl info

...

xen_commandline        : placeholder dom0_mem=3%,min:2G,max:4G com1=115200,8n1 console=com1,tty,vga dom0_max_vcpus=64 spec-ctrl=no sched=credit vcpu_migration_delay=1000 allowsuperpage ioapic_ack=new

...